Also, optimized SAPWM modulation wave has been utilized, improving the utility ratio of DC voltage and restraining effectively the output harmonic current of inverter.

并采用优化的SAPWM调制信号，提高了直流电压的利用率，并能有效地抑制逆变器输出的谐波电流。

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There are DC off-sets in the compensated source current of the APF with one-cycle control under bipolar modulation.

采用双极调制方式单周控制APF补偿后的电源电流中存在直流分量。

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Currcnt-type four quadrant converter is an AC-DC converting device with pulse width modulation, whose advantages are high power factor, low harmonic current and convenient regeneration etc.

电流型四象限变流器是一种脉冲宽度调制的交直流变换装置，具有功率因数高、谐波电流小、再生方便等优点。

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